Quote:
Originally Posted by RickeyD
Actually the drain tube (trap) is under negative pressure. The reason for the trap is to allow the condensate to drain under gravity pressure. Without the trap, condensate would not drain from the A coil pan because of this negative pressure. The condensate trapped in the trap allows the condensate to gravity drain.
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RickeyD thanks for the explanation!
My Unit is mounted at least 2 feet above the garage floor. With the drain running down the side of the unit (which the A coil is mounted even higher above the fan and heater unit. The Drain has built in P trap using the full length of the garage to outside Ac unit where the drain goes up and out to drain.
With the Fan running so far above the garage floor Fan air comes out the Wye connector when I take the cap off. IMO the hold length of the drain water is very heavy will not allow any air to be pulled up the drain. IMO this also allows slow movement of water to drain due to the length increasing build up over the years. It took 12 years plus to accumulate.